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If I replace the OEM horns on my 04' WRX with Hella Supertones will the OEM alarm now sound with the supertones or is there another horn I am missing just for the alarm? (I know there is a seperate horn for arming/disarming.) I can see there are 2 horns up front and one on the passenger side strut tower.

They will sound when your alarm goes off. Why don't you want the alarm to toot the Supertones? It seems like it would be great to have more noise in a situation where your alarm is actually being used as a theft deterrent, or to wake you up.

The Supertones will sound w/ the alarm. For some reason, when my Clifford alarm is set off, the siren as well as the horns go off. It is damn loud too. When I had the stock alarm in the car, the Supertones went off when triggered too.